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First Description of the Male Stomis stefanii Deuve (Coleoptera, Carabidae), a Rare Ground Beetle in Taiwan
台灣產稀有史氏長顎步行蟲Stomis stefanii Deuve（鞘翅目：步行蟲科）之首次記錄雄蟲
摘要
In this paper, the first male specimen found in northern Taiwan is reported, and its genitalia is illustrated. A comparison of both sexes revealed intraspecific variation. The similarities between Stomis stefanii and its closely related species S. prognathus (Bates) and S. zaonus Habu are further discussed.
並列摘要
2006年Deuve根據在奮起湖採得的單一雌蟲標本發表第一種產於台灣的Stomis步行蟲S.stefanii Deuve，迄今只新增另一筆採自溪頭的雌蟲紀錄。然而兩件標本在前胸背板前緣刻點密集度有所差異。正模式標本刻點密集，而溪頭的標本則無明顯刻點。本研究首度描述本種的雄蟲，該標本乃2014年採自宜蘭縣思源啞口。檢視標本後發現其前胸背板前緣刻點特徵與溪頭之雌性標本一致而異於正模式標本。種內變異為此特徵於個體間不一致較可能之解釋。文中描述本雄性外性器，並與外觀相似的種S. prognathus (Bates)及S. zaonus Habu比較。